Bargnani is in his 7th season and about 27 years old, DeRozan is in his 4th and 23. I rather keep DD because there's still a little bit of a learning curve remaining for DeRozan to improve/develop. At this point,Bargnani is who he is. Can't really expect him to transform into a premier defender. If he continues to score beyond 20+ppg then that's perfect because he certainly can. One thing,if the Raptors can trade DeRozan and acquire a bonafied SF like Gay(ideally) or even a Josh Smith then go with that,because they'll compliment the lineup well with Bargnani and the rest.